成分和组织对衬板钢在腐蚀料浆环境下的冲击磨损性能与机理的影响

利用改造后的MLD-10型冲击磨损试验机研究了3种冶金矿山湿磨衬板钢在铁矿石酸性矿浆中的冲击腐蚀磨损行为;采用扫描电子显微镜观察了试样磨损表面形貌,用光学显微镜分析了垂直于试样磨损表面的亚表层金相组织.结果表明:低碳高合金钢的耐冲击腐蚀磨损性能优于高锰钢及中碳合金钢;低碳高合金钢的冲击腐蚀磨损机制主要为挤出硬化棱剥落、轻微的腐蚀磨损及浅层疲劳剥落,高锰钢的主要冲击腐蚀磨损机制为较深层的累积变形疲劳剥落和严重的腐蚀磨损,而中碳合金钢的主要冲击腐蚀磨损机制为深层脆性剥落和严重的腐蚀磨损.

Effect of Composition and Microstructure on Impact Wear Behavior and Mechanism of Liner Steels in Corrosive Slurry

The impact corrosion and abrasion behavior of three steels used as the liner of wet-grinders in acidic-ironstone slurry and at an impact energy of 2.7 J was investigated using a modified impact corrosive test rig. The worn surface morphologies of the steels were observed using a scanning electron microscope, while the worn subsurface cross-sections of the steels after impact corrosive abrasion in the acidic-ironstone slurry for 8 h were analyzed using an optical microscope. It was found that the low carbon high-alloyed steel had much better impact corrosion and abrasion properties than the high manganese steel and medium carbon alloyed steel, which was ascribed to the differences in the compositions and microstructures of the three steels. Moreover, the low carbon high alloy steel was mainly characterized by spalling of extruded hardened edge, slight corrosive wear, and slight fatigue spalling during the impact corrosive abrasion process. Different from the low carbon high alloy steel, the high manganese steel was dominated by deeper fatigue spalling and heavy corrosive wear under the same testing conditions, while the medium carbon alloyed steel was characterized by deep brittle spalling and heavy corrosive wear.